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Message-ID: <5051D783.4000300@cube.nornet.local> Date: Thu, 13 Sep 2012 14:54:27 +0200 From: "norritt" <norritt@...nline.de> To: linux-ext4@...r.kernel.org CC: norritt@...nline.de Subject: Re: Ongoing data reorganization/defragmentation? On 12.09.2012 20:15, Lukáš Czerner wrote: > On Wed, 12 Sep 2012, norritt@...nline.de wrote: > > From what I've found out it's a good idea to: > - mount with noatime, discard (if drive supports trim) > The -o discard option might be tricky since some devices still > handles it quite badly and you can experience big performance drops > (http://people.redhat.com/lczerner/discard/ although it is somewhat > outdated already). But you might to try to see yourself if it does > not hurt your performance. > > The other option would be to use batched discard with fstrim (see > fstrim from util-linux) and run it once per (day, week, month). > > Thanks! > -Lukas > Hi Lukáš, thank you for pointing out the performance issue with the discard mount option, I hadn't read about that yet. As far is I know I'm using a quite special SSD (SanDisk, with a SanDisk controller), where most other SSDs on the market seem to be based on Marvell, Sandforce or Indilinx controllers. I saw that you were using SSDs from various vendors for your benchmarking tests. Was a model with SanDisk controller among the drives you tested? Would postmark data about disks with SanDisk controller be of interest to you? Regards Nor -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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